Item response theory analysis gradually becomes an important analytical tool for analyzing the characteristics of questions in examinations. Wechsler Intelligence Scale for Children, General Scholastic Ability Test, and the Basic Competence Test for Junior High School Students are in the scope of item response analysis. This paper uses three models in item response theory to analyze the result of an English placement test given to the freshmen class of 2009 in Chung Yuan Christien University. These three models are 1-parameter logistic model, 2-parameter logistic model, and 3-parameter logistic model.